lmlm4: K&R formatting cosmetics
[libav.git] / libavformat / m4vdec.c
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1/*
2 * RAW MPEG-4 video demuxer
3 * Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com>
4 *
2912e87a 5 * This file is part of Libav.
e3507058 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avformat.h"
4ca31edc 23#include "rawdec.h"
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24
25#define VISUAL_OBJECT_START_CODE 0x000001b5
26#define VOP_START_CODE 0x000001b6
27
28static int mpeg4video_probe(AVProbeData *probe_packet)
29{
30 uint32_t temp_buffer= -1;
31 int VO=0, VOL=0, VOP = 0, VISO = 0, res=0;
32 int i;
33
34 for(i=0; i<probe_packet->buf_size; i++){
35 temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];
36 if ((temp_buffer & 0xffffff00) != 0x100)
37 continue;
38
39 if (temp_buffer == VOP_START_CODE) VOP++;
40 else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++;
41 else if (temp_buffer < 0x120) VO++;
42 else if (temp_buffer < 0x130) VOL++;
43 else if ( !(0x1AF < temp_buffer && temp_buffer < 0x1B7)
44 && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;
45 }
46
187186c6 47 if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
e0f8be64 48 return AVPROBE_SCORE_EXTENSION;
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49 return 0;
50}
51
36ef5369 52FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", AV_CODEC_ID_MPEG4)